Proposals for targets to be observed by K2 in Campaigns 17, 18, and 19
are currently being solicited as part of K2 Guest Observer Cycle 6,
with Phase 1 submissions due on October 12, 2017.

The fields of these campaigns
will cover roughly 100 square degrees each towards the
constellations of Virgo (C17), Cancer (C18), and Aquarius/Pisces (C19).
To help inspire observing proposals,
we offer below a list of notable targets that will be visible
during these campaigns.

Campaign 17

Campaign 17 (Mar 1 - May 8, 2018) will observe a forward-facing field
located towards the constellation of Virgo.
The high galactic latitude of this field (+55°) makes it ideally suited
to survey a large number of galaxies for the K2 Supernova Cosmology Experiment.
The field also provides a substantial overlap with Campaign 6,
offering a longer baseline for stellar activity, asteroseismology, and AGN studies,
as well as enabling dozens of known K2 planet candidates to be revisited.
The field also provides access to ~20 deg2 of previously unexplored sky.

Campaign 18

Campaign 18 (May 12 - Aug 2, 2018) will observe a backward-facing campaign dedicated to revisit Campaign 5 and substantially overlap Campaign 16.
The third visit to this key part of the sky that contains the M44 and M67
clusters will enable users to study benchmark targets with a 3-year baseline and 8-month duty cycle, enabling original Kepler-like science
at a Galactic sightline that is located 130 degrees away from the original Kepler field in Cygnus.
The field also provides access to more than one hundred previously-published K2 planets and planet candidates.

Notable objects which may be proposed include:

M67: the benchmark open cluster with solar-like age and metallicity.

M44 (aka Praesepe or the Beehive): a 600 Myr-old open cluster revealed by K2 Campaign 5 to contain several planets.

GJ 9827 (V=10): a K-type dwarf recentlyrevealed to host at least three transiting planets near the rocky/gaseous divide.

HD 217107 (V=6): a bright G-type subgiant known to host two large RV planets.

Comet 2P/Encke (V=20): a well-known periodic comet.

Other candidate targets

In addition to the highlights listed above, Simbad lists a wealth of known objects that will be visible during these Campaigns. They include:

28,857 Galaxies;

1,979 known M dwarfs;

799 High Proper-Motion stars;

616 White Dwarfs;

462 RR Lyr Variables;

310 Active Galactic Nuclei;

204 (candidate) Brown Dwarfs;

44 Flare Stars;

21 Cataclysmic Variables.

A full table containing all Simbad sources that are visible in C17-18-19
can be downloaded from this website in CSV format (K2-C17-C19-Simbad.csv) or as a VOTable (K2-C17-C19-Simbad.xml.gz). Beware however that Simbad is not a full catalog of all known sources; it merely lists objects that have previously been discussed in the literature.
For the purpose of e.g. color-based target selections,
we recommend using a more complete source catalog such as the EPIC.

As a reminder, the K2fov Python package enables you to test whether targets fall within a campaign field,
while its sister K2ephem package
allows moving Solar System bodies to be checked.
Note that Campaigns 17-18-19 require K2fov version 7.0 or higher to be installed.